cli-kit

2019-09-12

Everything you need to create awesome command line interfaces

cli-kit

A command line application toolkit for Node.js.

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Features

  • Command line parsing
  • Support for command hierarchies
  • Auto-generated help
  • CLI template engine
  • External CLI extensions
  • Automatic Node.js version enforcement

Installation

npm install cli-kit --save

Usage

import CLI from 'cli-kit';

(async () => {
    const { argv, _ } = await new CLI({
        options: {
            '-f, --force': 'use the force',
            '--timeout [value]': {
                desc: 'the timeout duration',
                type: 'int'
            }
        }
    }).exec();

    console.log('options:', argv);
    console.log('args:', _);
})();

Architecture

In cli-kit, commands and options are grouped into "contexts". The main CLI instance defines the "global context". Each command defines a new context. Each context can have its own commands, options, and arguments. What you end up with is a hierarchy of contexts.

When cli-kit parses the command line arguments, it will check each argument against the global context to see if the argument can be identified as a known command, option, or argument. If it finds a command, it adds the command's context to a stack and re-parses any unidentified arguments.

This allows you to create deep and dynamic hierarchies of commands, options, and arguments.

API

class CLI

A CLIintance defines a global context for which you add commands, options, and arguments.

Extends Context> HookEmitter.

constuctor(opts)

  • opts: Object(optional)

    Various options to initialize the CLIinstance.

Example
const cli = new CLI({
    // An array of argument definitions. They are parsed in the order they are defined.
    args: [
        // An argument can be as simple as its name. Wrapping the name with `<` and `>` signifies
        // that the argument is required.
        '<arg1>',

        // To define an optional arguemnt, you can use `[` and `]`.
        '[arg2]',

        // Or simply omit the brackets
        'arg3',

        // For more options, you can specify an argument descriptor
        {
            // The argument name. Follows the same rules as above.
            name: 'arg4',

            // The argument's description to show in the help output.
            desc: undefined,

            // When `true`, hides the argument from usage string in the help output.
            hidden: false,

            // When `true`, captures all subsequent argument values into an array
            multiple: false,

            // Overrides the brackets and forces the argument to be required or optional.
            required: false,

            // There are several built-in types. See the "types" section below for more info.
            type: 'string'
        },

        // Adding `...` will capture all subsequent argument values into an array
        'arg4...'
    ],

    // Global flag to camel case property names derived from multi-word options/arguments.
    // Defaults to true, can be overwritten by the option/argument.
    camelCase: true,

    // An object of command names to command descriptors.
    commands: {
        'some-command': {
            // The action to perform when the command is parsed.
            action({ argv, _ }) {
                console.log('options:', argv);
                console.log('args:', _);
            },

            // An array of alternate command names.
            aliases: [ 'another-command' ],

            // Command specific args. See `args` section above.
            args: [],

            // When `true`, camel case all option and argument names in the `argv` result.
            camelCase: true,

            // An object of subcommand names to subcommand descriptors.
            commands: {},

            // The command description.
            desc: undefined,

            // When `true`, hides the command from the help output.
            hidden: false,

            // An object of option formats to option descriptors. See the `options` section below.
            options: {},

            // The command name to display in the help output. Defaults to the command name.
            title: undefined
        }
    },

    // The default command `exec()` should run if no command was found during parsing.
    // If `help` is `true` and no default command is specified, it will default to displaying the
    // help screen. If you want help, but do not want to default to the help command, then set the
    // `defaultCommand` to `null`.
    defaultCommand: undefined,

    // The CLI description to print on the help screen between the usage and commands/options/args.
    desc: undefined,

    // Adds the `-h, --help` to the global flags and enables the auto-generated help screen.
    // Defaults to `true`.
    help: true,

    // The exit code to return when the help screen is displayed. This is useful if you want to
    // force the program to exit if `--help` is specified and the user is chaining commands together
    // or after displaying the help screen and prevent further execution in the CLI's promise chain.
    helpExitCode: undefined,

    // The name of the program used by the help screen to display the command's usage.
    // Defaults to "program".
    name: 'program',

    // An object of option formats to option descriptors or an array of sorted group names and
    // objects of option formats to option descriptors.
    options: {
        //
    },

    // The title for the top-level (or "Global") context. This title is displayed on the help screen
    // when displaying the list of options.
    title: 'Global',

    // When set, it will automatically wire up the `-v, --version` option. Upon calling with your
    // program with `--version`, it will display the version and exit with a success (zero) exit
    // code.
    version: null
});

exec(args)

Parses the command line args and executes a command, if found.

  • args: Array<String>(optional)

    An array of arguments. Each argument is expected to be a string.

    Defaults to process.argv.slice(2).

Returns a Promisethat resolves an Argumentsobject. This object will contain the parsed options in argvand arguments in _.

Example
cli.exec()
    .then(({ argv, _ }) => {
        console.log('options:', argv);
        console.log('args:', _);
    });

class Context

Base class for CLIand Commandclasses.

Extends HookEmitter.

argument(arg)

Adds an argument to a CLIor Command.

  • arg: Argument, Object, or String.

    An argument descriptor. Either an Argumentinstance or an Objectto pass into a Argumentconstructor.

    An argument requires a name.

Returns a reference to the CLIor Command.

Example
// define a non-required argument "foo"
cli.argument('foo');

// define a non-required argument "wiz"
cli.argument('[wiz]');

// define a required argument "pow"
cli.argument('<pow>');

cli.argument({
    name: 'bar',
    type: 'int'
});

cli.argument(new Argument('baz'));

command(cmd, opts)

Adds a command to a CLIor Command.

TODO

option(optOrFormat, group, params)

Adds an option or group of options to a CLIor Command.

TODO

Who Uses cli-kit?

License

MIT

HomePage

https://github.com/cb1kenobi/cli-kit

Repository

https://github.com/cb1kenobi/cli-kit


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